130R166. A separate class is hereby prescribed for all vessels included in Class 7 in Schedule B, including furniture, fittings, radiocommunication equipment and other equipment attached thereto, acquired by a taxpayer(a) after 25 May 1976 and designed principally to determine the existence of accumulation of petroleum or natural gas, except a mineral resource, and to locate such accumulation or to determine its extent or quality, or to drill an oil or gas well; or
(b) after 22 May 1979 and designed principally to determine the existence of a mineral resource, to locate such resource or determine its extent or quality.